package com.read.apk;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.content.res.AXmlResourceParser;
import android.util.TypedValue;

/**
 * 分析APK文件，取得APK文件中的 包名、版本号及图标
 */
public class AnalysisApk {

	/**
	 * 分析 zip 文件(apk可以当成一个zip文件)
	 * 
	 * @param apkUrl
	 *            zip 文件，注意要是正宗的 zip 文件哦，不能是把 rar 的直接改为 zip 这样会出现
	 *            java.io.IOException: Negative seek offset 异常
	 * @param logoUrl
	 *            图标生成的地址
	 * @return String[] [0]:版本号 [1]:版本名称 [2]包名
	 * @throws ZipException
	 * @throws IOException
	 * @throws XmlPullParserException
	 */
	public static String[] unZip(String apkUrl, String logoUrl) throws ZipException, IOException,
			XmlPullParserException {
		String[] st = new String[3];
		byte b[] = new byte[4096];
		int length;
		ZipFile zipFile = new ZipFile(new File(apkUrl));
		try {
			Enumeration<? extends ZipEntry> enumeration = zipFile.entries();
			ZipEntry zipEntry = null;
			String fname = null;
			while (enumeration.hasMoreElements()) {
				zipEntry = (ZipEntry) enumeration.nextElement();
				fname = zipEntry.getName();
				if (!zipEntry.isDirectory()) {
					if ("AndroidManifest.xml".equals(fname)) {
						AXmlResourceParser parser = new AXmlResourceParser();
						parser.open(zipFile.getInputStream(zipEntry));
						while (true) {
							int type = parser.next();
							if (type == XmlPullParser.END_DOCUMENT) {
								break;
							}
							switch (type) {
							case XmlPullParser.START_TAG: {
								for (int i = 0; i != parser.getAttributeCount(); ++i) {
									if ("versionCode".equals(parser.getAttributeName(i))) {
										st[0] = getAttributeValue(parser, i);
									} else if ("versionName".equals(parser.getAttributeName(i))) {
										st[1] = getAttributeValue(parser, i);
									} else if ("package".equals(parser.getAttributeName(i))) {
										st[2] = getAttributeValue(parser, i);
									}
								}
							}
							}
						}
					}
					if (fname.matches("res/drawable.*/(icon|ic_launcher)\\.png")) {
						OutputStream out = new FileOutputStream(logoUrl);
						try {
							InputStream in = zipFile.getInputStream(zipEntry);
							while ((length = in.read(b)) > 0) {
								out.write(b, 0, length);
							}
						} finally {
							try {
								out.close();
							} catch (Exception e) {
							}
						}
					}
				}
			}
		} finally {
			try {
				zipFile.close();
			} catch (IOException e) {
			}
		}
		return st;
	}

	private static String getAttributeValue(AXmlResourceParser parser, int index) {
		int type = parser.getAttributeValueType(index);
		int data = parser.getAttributeValueData(index);
		if (type == TypedValue.TYPE_STRING) {
			return parser.getAttributeValue(index);
		}
		if (type == TypedValue.TYPE_ATTRIBUTE) {
			return String.format("?%s%08X", getPackage(data), data);
		}
		if (type == TypedValue.TYPE_REFERENCE) {
			return String.format("@%s%08X", getPackage(data), data);
		}
		if (type == TypedValue.TYPE_FLOAT) {
			return String.valueOf(Float.intBitsToFloat(data));
		}
		if (type == TypedValue.TYPE_INT_HEX) {
			return String.format("0x%08X", data);
		}
		if (type == TypedValue.TYPE_INT_BOOLEAN) {
			return data != 0 ? "true" : "false";
		}
		if (type == TypedValue.TYPE_DIMENSION) {
			return Float.toString(complexToFloat(data))
					+ DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
		}
		if (type == TypedValue.TYPE_FRACTION) {
			return Float.toString(complexToFloat(data))
					+ FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
		}
		if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
			return String.format("#%08X", data);
		}
		if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
			return String.valueOf(data);
		}
		return String.format("<0x%X, type 0x%02X>", data, type);
	}

	private static String getPackage(int id) {
		if (id >>> 24 == 1) {
			return "android:";
		}
		return "";
	}

	// ///////////////////////////////// ILLEGAL STUFF, DONT LOOK :)
	public static float complexToFloat(int complex) {
		return (float) (complex & 0xFFFFFF00) * RADIX_MULTS[(complex >> 4) & 3];
	}

	private static final float RADIX_MULTS[] = { 0.00390625F, 3.051758E-005F, 1.192093E-007F,
			4.656613E-010F };
	private static final String DIMENSION_UNITS[] = { "px", "dip", "sp", "pt", "in", "mm", "", "" };
	private static final String FRACTION_UNITS[] = { "%", "%p", "", "", "", "", "", "" };
}
